GATE 2016 EE (SET 1) Q13

13. In cylindrical coordinate system, the potential produced by a uniform ring charge is given by ϕ = f(r, z) where f is a continuous function of r and z. Let E be the resulting electric field. Then the magnitude of :——-

Solution:

V is given as static field in time invariant. Hence, $$\bigtriangledown \times E=0$$

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